Headquartered in Tulsa, Oklahoma, TWG is comprised of six companies that specialize in industry specific winches and supporting electronic systems. They include DP Winch, Gear Products, Greer Company, LANTEC, Pullmaster, and Tulsa Winch. TWG is part of the Dover Corporation, an NYSE-traded, multi-billion dollar corporation that manufactures a diverse range of products and components for commercial and industrial use.